Coloring-matter lake.



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CARL IMMERHEISER, OF LUDWIGSHAFENON-THE-RHINE, GERMANY, ASSIGNOR TOBADTSCHE ANILIN & SODA FABRIK, OF LUDWIGSHAFEN-ON-THE-RHINE, GER-- MANY,A OORPOBATION.

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Specification of Letters Patent;

Patented Aug. 13, 1907.

To all whom it may concern:

Be it known that l, CARL Iimnn'nnrsnn, doctor of philosophy and'chemist,a subject of the King of Bavaria, residing at Ludwigshafen-on-the-Rhine,Ger many, have invented new and useful Improvements in Coloring-MatterLakes, of which the following is a specification.

My invention relates to the production of coloring matter lakes.Although the azo coloring matters obtainable from amido-azobenzenedisulfonic acid and naphthol sulfo'nic acids yield lakes which are very'fast against the action of light, the coloring matter lakes which havehitherto been prepared from the corresponding coloring mattersobtainable from amidoazobenzene and from amidoazobenzene monosulfonicacid are not sufficiently fast against the action of light'to admit oftheir being used commercially. This is particularly emphasized in GermanPatent No. 154,533. I have now discovered that the statements containedin the said patent are not correct to such a general degree, but thatthe coloring matters obtainable by combining diazotized amidoazobenzene,or amidoazotoluene, with l-naphtholl-sulfonic acid yield lakes whichpossess an excellent fastness against the action of light and in thisrespect surpass even the lakesobtainable from amidoazobenzene disulionicacid and 1.4-naphthol sulfo'nic acid. For the purposes of this inventionamidoazobenzene and anilin are equivalent to amidoazotoluene andtoluidin respectively. My new lakes possess a red color and are fastagainst the action of light and upon reduction with tin and hydrochloricacid yield Z-amido-l naphtholi-sulfonic acid. p-phenylenediamin andanilin.

The following example will serve to illustrate further the nature of myinvention and now it can be carried confined. The parts are by weight.Add,

into practical effect, but my invention is not to this example. whilestirring, an aqueous solution, or'suspension of five (5) parts of thecoloring matter'obtainabl'e by com bining dia'zotized amidoazobenzene,or amidoazotoluene, with l-naphthol-4-sulfonic acid, to a paste ofaluminum hydrate which has been prepared iroman aqueous solution of ten(10) parts of aluminum sulfate and five (5) parts of sodium carbonate.Then precipitate the mixture so obtained either while cold or hot withabout seventeen (17) parts of barium chlorid in the form of a ten (10)per cent: solution. Filter off the preci itate if necessary wash, andeither dry it, or use it in the form of paste.

instead of the process above described, other processes used in themanufacture of lakes can be employed and duringthe manufacture, orsubsequently, Turkey red oil, glycerin, orother suitable substance, canbe added. Of course, if desired, the preparation of the coloring mattercan be made to take place simultaneously with the production of thelake.

Now what I claim is:

As new articles of manufacture coloring matter lakes obtainable byconverting azobenzeneazo-1-naphthol-4-sulfonic acid into an insolublesalt thereof which lakes possess a red color, are fast against theaction of light and upon reduction by means of tin and hydrochloric acidyield 2-amido-Lnaphthol-dsulfonic acid, para-phenylene diamin, andanilin.

In'testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

' CARL IMMERHEISER.

Witnesses:

J. Anne. LLOYD, Joe. E. Lnurn.

